[Docs] Cherry-pick VisualDL docs and fix typo (#4160)

* 【PaddleX No.1】PaddleX 文档优化 (#4064)

* 1. Add the documentation for VisualDL (Zh and En) 2. Modify the README.md document for PaddleX (update the En document simultaneously), mainly modifying the 'Documentation' section of this md file 3. Modify the FAQ document (Zh and En)

* 1. FAQ.md&FAQ.en.md: del the content about Quant;
2. VisualDL.en.md&VisualDL.md: del the logo and QR Code
3. mkdocs.yml: add the VisualDL
4. VisualDL: ready to add the content: How to use the log or weights produced by PaddleX with vdl. I am still in the process of learning.

* del the Prune content in FAQ

* Fix colon

---------

Co-authored-by: Echo-Nie <157974576+Echo-Nie@users.noreply.github.com>

Author: Bobholamovic

mkdocs.yml

@@ -237,7 +237,7 @@ plugins:
             心跳监测时序数据分类应用教程: Heartbeat Monitoring Time Series Data Classification Application Tutorial
             用电量长期预测应用教程: Long-term Electricity Consumption Forecasting Application Tutorial
             多语种语音识别模块: Multilingual Speech Recognition Task
-            可视化工具：VisualDL
+            可视化工具: VisualDL
             FAQ: FAQ
             近期更新: Recently Update
       repository: PaddlePaddle/PaddleX #仓库名称